[Harry] opens his last gift, from [Hagrid], which turns out to be the [Monster Book of Monsters]. He manages though, despite the book's attempts to bite him, to get a belt wrapped around it to keep himself safe.

The final letter is from [Hogwarts], with [Harry]'s booklist for his third year. It also includes a permission form for [Hogsmeade], which makes Harry dread trying to get the [Dursleys] to sign it - but nevertheless he heads off to bed, glad that it's his birthday.

At breakfast, [Harry] arrives to find the [Dursleys] watching their new TV, and hearing an announcement that a man named [Black] has escaped prison and is on the loose, prompting [Uncle Vernon] to complain that more convicts should be hanged.

[Harry] unexpectedly learns that [Aunt Marge] is coming for a visit, and thinks back to all the times she has tormented him. [Vernon] takes advantage of the opportunity to threaten Harry to behave before heading out the door.

The week continues on and one afternoon over lunch, when [Aunt Marge] criticizes [Harry]'s mother, [Harry] accidentally explodes her wineglass. He quickly escapes the room, worried about his possible expulsion from [Hogwarts].

[Harry] makes it through the rest of the week with [Aunt Marge] without incident, but on the final night of her stay, she criticizes Harry's parents loudly. Harry first defends them, then accidentally blows Marge up like a balloon and runs out of the house before [Vernon] can do anything to him.